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(FILES) This file photo taken on December 11, 1985 shows
US President Ronald Reagan addressing a group of tax reform supporters in Washington DC.
Ronald Reagan endured questions about his age and mental state and John McCain was pressured into releasing 1,000 pages of medical records. Democratic nominee Hillary Clinton, recently diagnosed with pneumonia, is hardly the first presidential candidate facing health concerns. / AFP PHOTO / MIKE SARGENT / TO GO WITH AFP STORY by Michael Mathes, "Clinton far from first candidate to suffer health scare"MIKE SARGENT/AFP/Getty Images